diff --git a/pkgs/by-name/ri/ripe-atlas-tools/package.nix b/pkgs/by-name/ri/ripe-atlas-tools/package.nix
index ba682025e732..ad8193e286fe 100644
--- a/pkgs/by-name/ri/ripe-atlas-tools/package.nix
+++ b/pkgs/by-name/ri/ripe-atlas-tools/package.nix
@@ -85,7 +85,7 @@ python3.pkgs.buildPythonApplication (finalAttrs: {
     "tests/test_docs.py"
   ];
 
-  HOME = "$TMPDIR"; # for cache generation.
+  env.HOME = "$TMPDIR"; # for cache generation.
 
   # Necessary because it confuse the tests when it does "from ripe.atlas.sagan import X"
   # version.py is used by Sphinx tests.